The specification discloses a touch control panel particularly adapted for use with an induction heating cook-top. The panel includes a plate of insulating material such as glass having outer and inner planar surfaces separated by a predetermined thickness. Discrete conductive film areas such as tin...http://www.google.co.uk/patents/US4149217?utm_source=gb-gplus-sharePatent US4149217 - Touch control panel for induction heating cook-top
